关键词: 质量平衡法, 基准方法, 标准物质, 不确定度评定

Abstract: In order to ensure the comparability of measurement results in different regions and at different times, the measurement results need to be traced to appropriate and prescribed reference standards. For the measurement of materials and samples in the fields of chemistry, biology, engineering and physics, the reference standard is a standard substance. It can be seen that the determination of reference materials is very important for the detection and quantification of materials. Reference material (RM) is a sufficiently uniform material or substance with one or more characteristic values that are relatively easy to determine. It can be used to assign values to materials, evaluate measurement methods, and calibrate measurement instruments. As one of the quantitative methods of reference materials, mass balance method is a commonly used purity measurement method, which deducts the content of impurities such as moisture, ash, volatile components and inorganic elements from 100%, and then determines the purity of materials according to the percentage of main components in organic components. The mass balance method has high accuracy and can be traced to the quality units in the international system of units. If the main components and various impurities in the sample are measured by the benchmark method to complete the measurement of the whole mass balance method, the mass balance method is expected to become a new benchmark method. Based on this, the principle of mass balance method and its application in the development of reference materials were introduced, and the latest application of mass balance method in reference materials was summarized in order to explore more possibilities of mass balance method in the development of reference materials.

Key words: mass balance method, benchmark method, reference material, uncertainty analysis